condition mean min max ZT0-3 0.6460898333333334 0.0545565 1.60173 ZT4-7 1.710773 1.710773 1.710773 ZT8-11 3.6754815 3.6754815 3.6754815 ZT12-15 2.39165 1.4202949999999999 3.363005 ZT16-19 2.54723 2.54723 2.54723 ZT20-23 0.2390955 0.2390955 0.2390955